U
Internal energy, kJ
v
Specific volume, m
3
=kg
v
Molar specific volume, m
3
=kmol
V
Volume, m
3
_
V
Volume flow rate, m
3
=s
V
Velocity, m=s
W
Work, kJ
W rev
Reversible, or maximum useful, work
_
W
Power, kW
x
Quality
x i
Mole fraction
y i
Mass fraction
Greek Letters
b
Thermal expansion coefficient, K
À1
D
Finite change in quantity
g th Thermal efficiency
h
Absolute temperature, defined by Eq. (46)
k
Integrating denominator
l
Chemical potential
m
Stoichiometric coefficient
n
Extent of reaction, kmol
q
Density, kg=m
3
Subscripts
a
Air
A
High temperature (as in T A )
atm
Atmospheric
B
Low temperature (as in T B )
C
Cold body
cv
Control volume
cs
Surface of control volume
e
Exit conditions
f
Saturated liquid
fg
Difference in property between saturated liquid and saturated vapor
g
Saturated vapor
G
Growth
H
High temperature or hot body
Symbols and Abbreviations
xix
Internal energy, kJ
v
Specific volume, m
3
=kg
v
Molar specific volume, m
3
=kmol
V
Volume, m
3
_
V
Volume flow rate, m
3
=s
V
Velocity, m=s
W
Work, kJ
W rev
Reversible, or maximum useful, work
_
W
Power, kW
x
Quality
x i
Mole fraction
y i
Mass fraction
Greek Letters
b
Thermal expansion coefficient, K
À1
D
Finite change in quantity
g th Thermal efficiency
h
Absolute temperature, defined by Eq. (46)
k
Integrating denominator
l
Chemical potential
m
Stoichiometric coefficient
n
Extent of reaction, kmol
q
Density, kg=m
3
Subscripts
a
Air
A
High temperature (as in T A )
atm
Atmospheric
B
Low temperature (as in T B )
C
Cold body
cv
Control volume
cs
Surface of control volume
e
Exit conditions
f
Saturated liquid
fg
Difference in property between saturated liquid and saturated vapor
g
Saturated vapor
G
Growth
H
High temperature or hot body
Symbols and Abbreviations
xix